1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890860b471919cdfb61b2cbc4e2abcd822d0214cc9f5e76ef3b9d2031124e826. Chain 2 (Bitcoin): anchored in block 954134 (2026-06-17T19:41:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d554723-4834-4917-9806-1ab5abbcd7c6.json and https://artists.proofprofile.net/proofs/artist/7d554723-4834-4917-9806-1ab5abbcd7c6.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb2e3218161ef4e0e5cc59e40b0d2b0a3438a29c46ca932ca6eb13244fce5798. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0724804 — a six-check JSON result.
Piano Concerto in F-Sharp Minor, Op. 10: II. Adagio ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd312723b156ff37f5e7cbfb4ae2d6a083e3107366033c8b552e77d8d763fc9f. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD9200155 — a six-check JSON result.
Piano Concerto in E Major, Op. 59: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6942e7abe2206706fc11be95cb31a2938f87e553ba51c4aad1775e5a4200477d. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331603963 — a six-check JSON result.
Lachenmann: Klaviermusik - World Premiere Recordings (Digitally Remastered)
C.M. von Weber: Piano Concertos Nos. 1 & 2 & Konzertstück in F Minor
The 99 Most Essential Pieces of Classical Music
Canon and Gigue in D Major, P. 37: I. Canon
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe69484264ade3528d47ce916a8a287556208d5f9346d30ec0f1605bec763ff4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL9750020 — a six-check JSON result.
Piano Sonata No. 14 in C-Sharp Minor, Op. 27 No. 2 "Moonlight": I. Adagio sostenuto
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21 Hungarian Dances, WoO 1: No. 5, Allegro in F-Sharp Minor
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36406e879235c3225c53751be20653274bf619fb095a5610e114cfb3393911d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL9750027 — a six-check JSON result.
14 Romances, Op. 34: No. 14, Vocalise (Lentamente)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9baac788d25cb8d455010730f701f58d6cdff1059b298c870a827a24484cf48. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL9750041 — a six-check JSON result.
Piano Concerto in A Minor, Op. 16: I. Allegro molto moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41d018ee723f300097e1d80453e9a6d5287e901c4b75366ebedde520c81f74d. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB8713010 — a six-check JSON result.
Recorder Concerto in C Major, RV 443: II. Largo
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Orchestral Suite No. 3 in D Major, BWV 1068: II. Air
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Album für die Jugend, Op. 68: No. 35, Mignon
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eccf7606e50d6ef33d0568337947d5204ecf205bd5d07e11fba4da5f154daa6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL6142742 — a six-check JSON result.
Prelude and Fugue in C Major, BWV 846: I. Prelude
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e5a61e079175ebfff0cbe5118dfec3dcc63efecd5005802d6ae19b7bfd69e2b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL6142642 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b25c4d85f649e15c2e5464d65dc521bbbf8bd5ccc39e0cb88a64de25f6a280. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL6142794 — a six-check JSON result.
Piano Sonata No. 16 in C Major, K. 545: II. Andante
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Piano Sonata No. 12 in F Major, K. 332: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2d95d76ac856cb4ca2ae1b8be3cf22088a50000fd2bd5b7a3009960fdf0bda. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL6142681 — a six-check JSON result.
8 Klavierstücke, Op. 76: IV. Intermezzo (Allegretto grazioso)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342e9e571b518e494ce8e439c00e0c06827469c11d1a79c3bb9ef5e1cfe0baa7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL6142799 — a six-check JSON result.
Coppélia, Act 3: Valse des heures (Waltz of the Hours)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8ce5f00c42f2aeae76efd81fc7f825450d9c1127a8a7de283fbfb4320ffddd. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB790401126 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc241302049964c3cd3d4352783f3ffa9cd75a28e2e0dbf7bbf9f4caf7d64262b. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB790401231 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24893b57291cea16267c85456465d2ecc5cf20aa99733c551d7d4d778669aec5. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB790303310 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82832ed67678cf1e6948aa91ed4ad28d76ccc515ff8d901546f20c1f8c18935. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEP0662140 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c419d9f95bc90206503625cd6f49c8802df41712a76eeff652b5b0e1112d910. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEI9634060 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01da1b641c69912e47c046bf6d6bdf3f16bd8f2d30897975544ec5de0e876845. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0739003 — a six-check JSON result.
Serenade for Strings, Op. 11: I. Preludium
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e288bbdb9f5c2c300ec647374e18481206469edfa396466c3e187ba4ad9f0f7. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USZGD1500138 — a six-check JSON result.
Invitation to the Dance, Op. 65 (Arr. for Orchestra by Hector Berlioz)
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The Era of Jane Austen (Music of the Late 18th - Early 19th Century)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2f86c5f8a006f836224031954df1f3719eb04aed3f2c21969f2230d4945bea. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL6142781 — a six-check JSON result.
Five Hours of Classical Adagios (Amazon Exclusive)
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Work From Home - Classical Music for Focus & Concentration
The Cello Virtuoso: Laszlo Varga plays Haydn, Tchaikovsky and Saint-Saëns